Weak localization of magnons in a disordered two-dimensional antiferromagnet

Article

关键词: THERMAL TRANSPORT-COEFFICIENTS;    SPIN;    MAGNETORESISTANCE;    CONDUCTIVITY;    FERROMAGNETS;    DIFFUSION;    PARTICLES;    INSULATOR;    ABSENCE;    SYSTEM;   

DOI  :  10.1103/PhysRevB.97.020407

来源: SCIE

【 摘 要 】

We propose the weak localization of magnons in a disordered two-dimensional antiferromagnet. We derive the longitudinal thermal conductivity kappa(xx) for magnons of a disordered Heisenberg antiferromagnet in the linear-response theory with the linear-spin-wave approximation. We show that the back scattering of magnons is enhanced critically by the particle-particle-type multiple impurity scattering. This back scattering causes a logarithmic suppression of kappa(xx) with the length scale in two dimensions. We also argue a possible effect of inelastic scattering on the temperature dependence of kappa(xx). This weak localization is useful to control turning the magnon thermal current on and off.

【 授权许可】

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